Please helppp

So I was over at my mothers house this evening for coffee me and my moms relationship has gone to shit over the past few years due to some stuff that happened in my younger years... Well I had taken my son over to see his Nana because I'm that person who the issue is between me and my mother not my mother and son so there for my son doesn't need to be punished well as we are sitting chatting and her boyfriend was there my mother looked at my and said out of all my children you are the most disrespectful little bitch that I have raised.. Mind you out off all her children I'm the only one who graduated high school had a job at 15 as well as went to collage all my siblings either live with my grandmother or a family member. So obviously I was hurt by that comment beings me and my mother used to be like two peas in a pod and were each others back bones and she was just vile and rude in front of my son... So I said to her boyfriend I'm sorry that seeing my son was under this circumstance but me and my son are leaving I swooped up my boy and got in the car and came home trying to hold it together until I got inside and I was explaing to my husband what happened he was NOT understanding at all and just wanted to know what my mother said about HIM!? Is it wrong for me to be upset with him..? And as to my mother goes I need advice as to what to do.. I don't want to keep my son from his grandmother.. But I don't want to keep being mentally abused... Nor do I want my son alone with her because god knows what she's going to tell him... I'm at loss of words how would you ladies feel or do?